This corpus is a collection of public USENET postings. This corpus was collected between Oct 2005 and Jan 2010, and covers 47860 English language, non-binary-file news groups. Despite our best effots, this corpus includes a very small number of non-English words, non-words, and spelling errors. The corpus is untagged, raw text. It may be neccessary to process the corpus further to put the corpus in a format that suits your needs.

Method of Transmission: For most users, we strongly reccommend using a BitTorrent Client. This is the most efficient method for more users. For those users on Internet2, the HTTP service works well. If you are NOT on the Internet2 (most non-academic networks) and cannot use BitTorrent, please try the Limited HTTP service, with global daily download limits.

Processing: All NNTP headers were discarded [there is no way to recover them, and this is done to ensure the privacy of the authors.] All message bodies that had the same 128bit SHA-1 hash as other message bodies were discarded (reducing duplication of documents from cross-posts). To reduce the amount of garbage data and non-english text in the corpus, the following pre-processing steps were taken:

• All documents that were less than 500 words and greater than 500,000 words were omitted.
• Documents that contained less than 90% English words were omitted. (English words were defined as words that are contained in a 100,000 words dictionary of english).

To anonymize the text, we aslo did the following:

• Replaced all of the obvious e-mail addresses with the token <EMAILADDRESS>.
• Replaced all of the obvious HTTP URLs with the token <URL> , and news URLs with <NEWSURL>.

Corpus size:   over 25 billion words, over 28 million documents
Data size:   over 28gb, compressed (delivered as weekly bundles of about 150 Mb each)


Citation: Shaoul, C. & Westbury C. (2009) A USENET corpus (2005-2009)  Edmonton, AB: University of Alberta (downloaded from http://www.psych.ualberta.ca/~westburylab/downloads/usenetcorpus.download.html)

Acknowledgments: This work would not have been possible without the hardware and software provided by the TaPoR project. This research is also supported by NSERC.

If you have any questions about this corpus, please contact Cyrus Shaoul

PLEASE NOTE THE LICENSE THAT THIS CORPUS IS RELEASED UNDER:

This Usenet Corpus by Cyrus Shaoul is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Canada License.

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